package cn.lcsjsxy.yxc.reflect;

import cn.lcsjsxy.yxc.reflect.Person.RichPerson;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * 获取运行时类的方法结构
 */
public class MethodTest {

    @Test
    public void test1() {
        Class clazz = RichPerson.class;

        //getMethods():获取当前运行时类及其所有父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for (Method m : methods) {
            System.out.println(m);
        }

        System.out.println();

        //getDeclaredMethods()：获取当前运行时类中声明的所有方法。（不包含父类中声明的方法）
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method m : declaredMethods) {
            System.out.println(m);
        }
    }

    /*
     * @Xxxx
     * 权限修饰符     返回值类型   方法名(参数类型1 形参名1) throws XxxException{}
     * */
    @Test
    public void test2() {
        Class clazz = RichPerson.class;
        Method[] declaredMethods = clazz.getDeclaredMethods();

        for (Method m : declaredMethods) {
            //1.获取方法声明的注解
            Annotation[] annos = m.getAnnotations();
            for (Annotation a : annos) {
                System.out.println(a);
            }

            //2.关于权限修饰符
            System.out.print(Modifier.toString(m.getModifiers()) + "\t");

            //3.返回值类型
            System.out.println(m.getReturnType().getName() + "\t");

            //4.方法名
            System.out.print(m.getName() + "(");

            //5.形参列表
            Class[] parameterTypes = m.getParameterTypes();
            if (!(parameterTypes == null && parameterTypes.length == 0)) {
                for (Class c : parameterTypes) {
                    System.out.println(c.getName() + ")");
                }
            }

            //6.抛出的异常
            Class[] exceptionTypes = m.getExceptionTypes();
//            if (!(exceptionTypes==null && exceptionTypes.length==0)){
//                System.out.println("throws ");
//                for (int i=0;i<exceptionTypes.length;i++){
//                    if (i==exceptionTypes.length-1){
//                        System.out.println(exceptionTypes[i].getName());
//                        break;
//                    }
//                    System.out.println(exceptionTypes[i].getName()+",");
//                }
//            }
            if (exceptionTypes.length > 0){
                System.out.println("throws ");
                for (int i=0;i<exceptionTypes.length;i++) {
                    if (i == exceptionTypes.length - 1) {
                        System.out.println(exceptionTypes[i].getName());
                        break;
                    }
                    System.out.println(exceptionTypes[i].getName()+",");
                }
            }

            System.out.println();
        }
    }
}
